105. Aquarius and Libra should not be visible between latitudes 65 degrees north to 90 degrees south, Virgo between 80 degrees north to 80 degrees south and Orion between 85 degrees north to 75 degrees south on a spherical Earth

"Aquarius and Libra can be seen from 65 degrees North to 90 degrees South! The constellation Virgo is visible from 80 degrees North down to 80 degrees South, and Orion can be seen from 85 degrees North all the way to 75 degrees South latitude! These are all only possible because the “hemispheres” are not spheres at all but concentric circles of latitude extending outwards from the central North Pole with the stars rotating over and around. "

Source: https://en.wikipedia.org/wiki/Declination

Dubay does not understand basic trigonometry

Dubay is making the same spurious point as proof 103  and proof 104 with different constellations.  The reasons why the proof is nonsense remains the same.

You will always be able to see a constellation at some point in the year if the difference between its declination (angle above the equator) and the observer’s latitude is not more than 90 degrees.




The difference between the constellation’s declination and the observer’s latitude is never more than 90°, so of course, all these constellations are visible at the stated latitudes.

a. Aquarius: Declination  +3.3° to -24.9°
b. Libra: Declination -15°
c. Virgo: Declination -4°
d. Orion: Declination  +5°

For the range of latitudes the constellation is observable from add and subtract 90° from the declination.  The maximum for each calculation is +90° or -90° because the these are the poles.

Aquarius is visible from +90°  to -90°.  In other words from all latitudes because the constellation covers a wide range of celestial latitudes.

Libra is visible from +75° to -90°, Virgo from +86° to -90° and Orion from +90° to -85°.

I.e. All the observations given by Dubay are perfectly consistent with a spherical Earth.

Is Dubay just incompetent at trigonometry?  Probably, but I believe that in this "proof" he is deliberately lying in order to back up his spurious claim that the observed stars would be impossible on a spherical Earth.


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